1. 42.98−[(18−23):2+32]42.98−[(18−23):2+32]
=42.98−[(18−8):2+9]=42.98−[(18−8):2+9]
=42.98−14=42.98−14
=14.(3.98−1)=14.(3.98−1)
=4102=4102
2 .(56.46−25.23):23C2.(56.46−25.23):23
=56.46:23−25.23:23=56.46:23−25.23:23
=56.2−25=56.2−25
=112−25=112−25
=87=87
3 .1024:(-2^4)+140:(38+2^5)-7^23:7^21$
=1024:16+140:70−49=1024:16+140:70−49
=64+2−49=64+2−49
=17
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