⑴4.2×(6.18-3.03)=(4 0.2)×(3 0.15)=12 0.6 0.6 0.03=13.23 ⑵98.8×3.8÷98.8=98.8÷98.8×3.8=1×3.8=3.8 ⑶5.4×12-5.4-5.4=5.4×12-2×5.4=5.4×(12-2)=5.4×10=54 ⑷11÷0.25 19÷0.25=(11 19)÷0.25=30÷0.25=120
1题4.2x3.15=4.2x3+0.2x3.15=13.23
2t题98.8除以98.8x3.8=3.8
3ti5.4x[12-1-1]=5.4x10=54
4 [11+19]除以0.24=160
(4+0.2)x(3.15+3.03-3.03)=12.6+0.63
98.8x(3.8-1)=98.8x2.8
5.4x(12-1-1)=5.4x10
(11+19)÷0.25=30÷0.25
正常算到这就可以了